Influence of Cr2O3 Content on Slag Viscosity Under Different Melting States and Temperature Programs

2019 ◽  
pp. 125-135
Author(s):  
Fang Yuan ◽  
Tuo Wu ◽  
Yanling Zhang ◽  
Zheng Zhao
Keyword(s):  
Slag Viscosity ◽  
Cr2o3 Content

The Effect of Calcium Fluoride on Slag Viscosity

2011 ◽  
Vol 42 (5) ◽  
pp. 928-931 ◽  
Author(s):  
Liushun Wu ◽  
Jimmy Gran ◽  
Du Sichen
Keyword(s):  
Calcium Fluoride ◽  
Slag Viscosity

Non-Arrhenius Viscosity Models for Molten Silicate Slags with Constant Pre-Exponential Parameter: A Comparison to Arrhenius Model

2016 ◽  
Vol 35 (3) ◽  
pp. 261-267 ◽  
Author(s):  
Lei Gan ◽  
Chaobin Lai ◽  
Huihui Xiong
Keyword(s):  
Low Temperature ◽  
Molten Slag ◽  
Slag Viscosity ◽  
Arrhenius Model ◽  
Exponential Parameter ◽  
Viscosity Models ◽  
Lower Viscosity ◽  
Molten Silicate ◽  
Parameter Values

AbstractThe accuracies of molten slag viscosity fitting and low-temperature extrapolation were compared between four two-variable models: Arrhenius, Weymann–Frenkel (WF), and Vogel–Fulcher–Tammann (VFT) and Mauro, Yue, Ellison, Gupta and Allan (MYEGA) models with constant pre-exponential parameter, based on a molten slag viscosity database consisting of over 800 compositions and 5,000 measurements. It is found that over wide ranges of pre-exponential parameter, the VFT and MYEGA models have lower viscosity fitting errors and much higher low-temperature viscosity extrapolation accuracies than Arrhenius and WF models. The pre-exponential parameter values of –2.8 for VFT and –2.3 for MYEGA are recommended.

scholarly journals Study of the Viscosity of a La2O3-SiO2-FeO Slag System

2019 ◽  
Vol 38 (2019) ◽  
pp. 897-904
Author(s):  
Wenbin Xin ◽  
Yongchun Deng ◽  
Yinju Jiang ◽  
Yongqiang Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Slag System ◽  
Additive Effect ◽  
Slag Viscosity ◽  
Minor Components ◽  
Temperature Reduction

AbstractThe viscosity and break temperature of La2O3–SiO2-FeO slag was investigated to develop low-Al2O3 or Al2O3-free slag for the effective recovery of rare-earth metals. When La2O3 content is fixed (45, 50 and 55 mass%), the viscosity and break temperature of La2O3–SiO2-FeO slag decrease with an increase in FeO content and a decrease in SiO2 content. A higher La2O3 content in the La2O3-SiO2-FeO ternary slag yields a lower slag viscosity but a higher break temperature. Individual minor components of Al2O3, MnO and B2O3 does not affect, or decreases slightly the viscosity of La2O3–SiO2-FeO slag, whereas the slag break temperature is reduced so that the reduction ability order is ranked as B2O3 > Al2O3 > MnO. A small amount of two components Al2O3 + MnO and Al2O3 + B2O3 has little effect on the viscosity of the slag but it has an additive effect on the slag break-temperature reduction.

scholarly journals Researches on development of alumina-chromia-zirconium silicate refractories containing 60 % Cr2O3

2020 ◽  
Vol 120 ◽  
pp. 12-28
Author(s):  
P. O. Kushchenko ◽  
V. V. Primachenko ◽  
I. G. Shulyk ◽  
Yu. Ye. Mishnyova ◽  
K. I. Kushchenko ◽  
...  
Keyword(s):  
Corrosion Mechanism ◽  
Pressing Method ◽  
Refractory Structure ◽  
Oxide Addition ◽  
Zirconium Silicate ◽  
Cold Crushing Strength ◽  
Cr2o3 Content ◽  
Corrosive Effect ◽  
Dry Pressing ◽  
Shock Resistance

Researches of a branch composition and firing atmosphere influence on structure and properties of pressed alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content were carried out. The optimal branch composition which after firing in oxidizing atmosphere provides obtaining of samples with open porosity 24.8 %, apparent density 3.46 g/cm3, cold crushing strength 78 N/mm2 and thermal shock resistance by 950 ºС — water — 7 thermal cycles was established. The phase composition of samples was determined. It has been shown that, firing in a reducing atmosphere, as well as titanium oxide addition, have no significant effect on samples properties. Corrosion resistance comparative researches of alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content and refractory brand KHTSS-30 with 30 % Cr2O3 content to glass «E» and basalt melts by crucible method at a temperature of 1580 °C with an exposure time of 8 hours were carried out. It has been established that, glass «E» and basalt impregnate refractories, moreover for samples with the developed optimal composition the impregnation depth was the smallest in comparison with samples of other compositions. The corrosion mechanism has been established, which consists in the penetration of glass «E» and basalt melts into refractory with further dissolution of corundum grains in them. Sintered Cr2O3 and solid solutions based on it in the composition of samples prevent corrosion, reducing the interaction area of melts with corundum grains, and when exposed to basalt melt, also forming spinelid with its components, which slows down further penetration of melt into refractory structure, thereby reducing its corrosive effect on the refractory. Based on the obtained results, a technology of a new domestic type of product (alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content manufactured by semi-dry pressing method) was developed.

Evaluation of Microporosity in Activated Carbons with High ASH (Cr2O3) CONTENT

1991 ◽  
pp. 449-457 ◽  
Author(s):  
M.A. Martínez-Sánchez ◽  
J.M. Martín-Martínez ◽  
A.C. Orgilés- Barceló ◽  
F. Rodríguez-Reinoso ◽  
M.J. Sellés-Pérez
Keyword(s):  
Activated Carbons ◽  
Cr2o3 Content

Measurement and Prediction of Low-Rank Coal Slag Viscosity

1984 ◽  
pp. 195-209 ◽  
Author(s):  
ROBERT C. STREETER ◽  
ERLE K. DIEHL ◽  
HAROLD H. SCHOBERT
Keyword(s):  
Low Rank ◽  
Slag Viscosity ◽  
Low Rank Coal ◽  
Coal Slag

scholarly journals Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 496 ◽  
Author(s):  
Weiqiang Liu ◽  
Lei Shao ◽  
Henrik Saxén
Keyword(s):  
Blast Furnace ◽  
Furnace Operation ◽  
Slag Viscosity ◽  
Two Dimensional ◽  
Furnace Hearth ◽  
Breakthrough Time ◽  
Initial Amount ◽  
Blast Pressure ◽  
Blast Furnace Hearth ◽  
Model Study

The smooth drainage of produced iron and slag is a prerequisite for stable and efficient blast furnace operation. For this it is essential to understand the drainage behavior and the evolution of the liquid levels in the hearth. A two-dimensional Hele–Shaw model was used to study the liquid–liquid and liquid–gas interfaces experimentally and to clarify the effect of the initial amount of iron and slag, slag viscosity, and blast pressure on the drainage behavior. In accordance with the findings of other investigators, the gas breakthrough time increased and residual ratios for both liquids decreased with an increase of the initial levels of iron and slag, a decrease in blast pressure, and an increase in slag viscosity. The conditions under which the slag–iron interface in the end state was at the taphole and not below it were finally studied and reported.

Effect of CaO/Fe2O3 ratio on slag viscosity behavior under entrained flow gasification conditions

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 116129 ◽  
Author(s):  
Zefeng Ge ◽  
Lingxue Kong ◽  
Jin Bai ◽  
Huiling Zhao ◽  
Xi Cao ◽  
...  
Keyword(s):  
Slag Viscosity ◽  
Entrained Flow ◽  
Viscosity Behavior ◽  
Entrained Flow Gasification

scholarly journals Effect of MgO and K2O on High-Al Silicon–Manganese Alloy Slag Viscosity and Structure

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 810 ◽  
Author(s):  
Xiangdong Xing ◽  
Zhuogang Pang ◽  
Jianlu Zheng ◽  
Yueli Du ◽  
Shan Ren ◽  
...  
Keyword(s):  
Molten Slag ◽  
Photoelectron Spectra ◽  
Slag Viscosity ◽  
High Melting Point ◽  
Manganese Alloy ◽  
Flow Activation Energy ◽  
Slag Structure ◽  
Phase Spinel ◽  
Flow Activation ◽  
Manganese Slag

The viscosity, melting proprieties, and molten structure of the high-Al silicon–manganese slag of SiO2–CaO–25 mass% Al2O3–MgO–MnO–K2O system with a varying MgO and K2O content were studied. The results show that with the increase in MgO content from 4 to 10 mass%, the measured viscosity and flow activation energy decreases, but K2O has an effect on increasing those of slags. However, the melting temperature increases due to the formation of high-melting-point phase spinel. Meanwhile, Fourier transform infrared (FTIR) and X-ray photoelectron spectra (XPS) were conducted to understand the variation of slag structure. The O2− dissociates from MgO can interact with the O0 within Si–O or Al–O network structures, corresponding to the decrease in the trough depth of [SiO4] tetrahedral and [AlO4] tetrahedral. However, when K2O is added into the molten slag, the K+ can accelerate the formation of [AlO4] tetrahedra, resulting in the increase in O0 and O− and the polymerization of the structure.

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